题目

Our city has changed a lot; who can tell what it will be like in ___ ten years?   A. other   B. next   C. more   D. another 答案:D设A是直角坐标平面上所有点组成的集合,如果由A到A的映射f为:f:(x,y)→(x+y,2x-3y)那么点(1,2)的原象是点________.
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